var Attacklab=Attacklab||{};
Attacklab.showdown=Attacklab.showdown||{};
Attacklab.showdown.converter=function() {

	//
	// Globals:
	//

	// Global hashes, used by various utility routines
	var g_urls;
	var g_titles;
	var g_html_blocks;

	// Used to track when we're inside an ordered or unordered list
	// (see _ProcessListItems() for details):
	var g_list_level = 0;


	this.makeHtml = function(text) {
	//
	// Main function. The order in which other subs are called here is
	// essential. Link and image substitutions need to happen before
	// _EscapeSpecialCharsWithinTagAttributes(), so that any *'s or _'s in the <a>
	// and <img> tags get encoded.
	//

		// Clear the global hashes. If we don't clear these, you get conflicts
		// from other articles when generating a page which contains more than
		// one article (e.g. an index page that shows the N most recent
		// articles):
		g_urls = new Array();
		g_titles = new Array();
		g_html_blocks = new Array();

		// attacklab: Replace ~ with ~T
		// This lets us use tilde as an escape char to avoid md5 hashes
		// The choice of character is arbitray; anything that isn't
	    // magic in Markdown will work.
		text = text.replace(/~/g,"~T");

		// attacklab: Replace $ with ~D
		// RegExp interprets $ as a special character
		// when it's in a replacement string
		text = text.replace(/\$/g,"~D");

		// Standardize line endings
		text = text.replace(/\r\n/g,"\n"); // DOS to Unix
		text = text.replace(/\r/g,"\n"); // Mac to Unix

		// Make sure text begins and ends with a couple of newlines:
		text = "\n\n" + text + "\n\n";

		// Convert all tabs to spaces.
		text = _Detab(text);

		// Strip any lines consisting only of spaces and tabs.
		// This makes subsequent regexen easier to write, because we can
		// match consecutive blank lines with /\n+/ instead of something
		// contorted like /[ \t]*\n+/ .
		text = text.replace(/^[ \t]+$/mg,"");

		// Turn block-level HTML blocks into hash entries
		text = _HashHTMLBlocks(text);

		// Strip link definitions, store in hashes.
		text = _StripLinkDefinitions(text);

		text = _RunBlockGamut(text);

		text = _UnescapeSpecialChars(text);

		// attacklab: Restore dollar signs
		text = text.replace(/~D/g,"$$");

		// attacklab: Restore tildes
		text = text.replace(/~T/g,"~");
		
		return text;
	}


	var _StripLinkDefinitions = function(text) {
	//
	// Strips link definitions from text, stores the URLs and titles in
	// hash references.
	//

		// Link defs are in the form: ^[id]: url "optional title"

		/*
			var text = text.replace(/
					^[ ]{0,3}\[(.+)\]:  // id = $1  attacklab: g_tab_width - 1
					  [ \t]*
					  \n?				// maybe *one* newline
					  [ \t]*
					<?(\S+?)>?			// url = $2
					  [ \t]*
					  \n?				// maybe one newline
					  [ \t]*
					(?:
					  (\n*)				// any lines skipped = $3 attacklab: lookbehind removed
					  ["(]
					  (.+?)				// title = $4
					  [")]
					  [ \t]*
					)?					// title is optional
					(?:\n+|$)
				  /gm,
				  function(){...});
		*/
		var text = text.replace(/^[ ]{0,3}\[(.+)\]:[ \t]*\n?[ \t]*<?(\S+?)>?[ \t]*\n?[ \t]*(?:(\n*)["(](.+?)[")][ \t]*)?(?:\n+|\Z)/gm,
			function (wholeMatch,m1,m2,m3,m4) {
				m1 = m1.toLowerCase();
				g_urls[m1] = _EncodeAmpsAndAngles(m2);  // Link IDs are case-insensitive
				if (m3) {
					// Oops, found blank lines, so it's not a title.
					// Put back the parenthetical statement we stole.
					return m3+m4;
				} else if (m4) {
					g_titles[m1] = m4.replace(/"/g,"&quot;");
				}
				
				// Completely remove the definition from the text
				return "";
			}
		);

		return text;
	}


	var _HashHTMLBlocks = function(text) {
		// attacklab: Double up blank lines to reduce lookaround
		text = text.replace(/\n/g,"\n\n");

		// Hashify HTML blocks:
		// We only want to do this for block-level HTML tags, such as headers,
		// lists, and tables. That's because we still want to wrap <p>s around
		// "paragraphs" that are wrapped in non-block-level tags, such as anchors,
		// phrase emphasis, and spans. The list of tags we're looking for is
		// hard-coded:
		var block_tags_a = "p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|script|noscript|form|fieldset|iframe|math|ins|del"
		var block_tags_b = "p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|script|noscript|form|fieldset|iframe|math"

		// First, look for nested blocks, e.g.:
		//   <div>
		//     <div>
		//     tags for inner block must be indented.
		//     </div>
		//   </div>
		//
		// The outermost tags must start at the left margin for this to match, and
		// the inner nested divs must be indented.
		// We need to do this before the next, more liberal match, because the next
		// match will start at the first `<div>` and stop at the first `</div>`.

		// attacklab: This regex can be expensive when it fails.
		/*
			var text = text.replace(/
			(						// save in $1
				^					// start of line  (with /m)
				<($block_tags_a)	// start tag = $2
				\b					// word break
									// attacklab: hack around khtml/pcre bug...
				[^\r]*?\n			// any number of lines, minimally matching
				</\2>				// the matching end tag
				[ \t]*				// trailing spaces/tabs
				(?=\n+)				// followed by a newline
			)						// attacklab: there are sentinel newlines at end of document
			/gm,function(){...}};
		*/
		text = text.replace(/^(<(p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|script|noscript|form|fieldset|iframe|math|ins|del)\b[^\r]*?\n<\/\2>[ \t]*(?=\n+))/gm,hashElement);

		//
		// Now match more liberally, simply from `\n<tag>` to `</tag>\n`
		//

		/*
			var text = text.replace(/
			(						// save in $1
				^					// start of line  (with /m)
				<($block_tags_b)	// start tag = $2
				\b					// word break
									// attacklab: hack around khtml/pcre bug...
				[^\r]*?				// any number of lines, minimally matching
				.*</\2>				// the matching end tag
				[ \t]*				// trailing spaces/tabs
				(?=\n+)				// followed by a newline
			)						// attacklab: there are sentinel newlines at end of document
			/gm,function(){...}};
		*/
		text = text.replace(/^(<(p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|script|noscript|form|fieldset|iframe|math)\b[^\r]*?.*<\/\2>[ \t]*(?=\n+)\n)/gm,hashElement);

		// Special case just for <hr />. It was easier to make a special case than
		// to make the other regex more complicated.  

		/*
			text = text.replace(/
			(						// save in $1
				\n\n				// Starting after a blank line
				[ ]{0,3}
				(<(hr)				// start tag = $2
				\b					// word break
				([^<>])*?			// 
				\/?>)				// the matching end tag
				[ \t]*
				(?=\n{2,})			// followed by a blank line
			)
			/g,hashElement);
		*/
		text = text.replace(/(\n[ ]{0,3}(<(hr)\b([^<>])*?\/?>)[ \t]*(?=\n{2,}))/g,hashElement);

		// Special case for standalone HTML comments:

		/*
			text = text.replace(/
			(						// save in $1
				\n\n				// Starting after a blank line
				[ ]{0,3}			// attacklab: g_tab_width - 1
				<!
				(--[^\r]*?--\s*)+
				>
				[ \t]*
				(?=\n{2,})			// followed by a blank line
			)
			/g,hashElement);
		*/
		text = text.replace(/(\n\n[ ]{0,3}<!(--[^\r]*?--\s*)+>[ \t]*(?=\n{2,}))/g,hashElement);

		// PHP and ASP-style processor instructions (<?...?> and <%...%>)

		/*
			text = text.replace(/
			(?:
				\n\n				// Starting after a blank line
			)
			(						// save in $1
				[ ]{0,3}			// attacklab: g_tab_width - 1
				(?:
					<([?%])			// $2
					[^\r]*?
					\2>
				)
				[ \t]*
				(?=\n{2,})			// followed by a blank line
			)
			/g,hashElement);
		*/
		text = text.replace(/(?:\n\n)([ ]{0,3}(?:<([?%])[^\r]*?\2>)[ \t]*(?=\n{2,}))/g,hashElement);

		// attacklab: Undo double lines (see comment at top of this function)
		text = text.replace(/\n\n/g,"\n");
		return text;
	}

	var hashElement = function(wholeMatch,m1) {
		var blockText = m1;

		// Undo double lines
		blockText = blockText.replace(/\n\n/g,"\n");
		blockText = blockText.replace(/^\n/,"");
		
		// strip trailing blank lines
		blockText = blockText.replace(/\n+$/g,"");
		
		// Replace the element text with a marker ("~KxK" where x is its key)
		blockText = "\n\n~K" + (g_html_blocks.push(blockText)-1) + "K\n\n";
		
		return blockText;
	};

	var _RunBlockGamut = function(text) {
	//
	// These are all the transformations that form block-level
	// tags like paragraphs, headers, and list items.
	//
		text = _DoHeaders(text);

		// Do Horizontal Rules:
		var key = hashBlock("<hr />");
		text = text.replace(/^[ ]{0,2}([ ]?\*[ ]?){3,}[ \t]*$/gm,key);
		text = text.replace(/^[ ]{0,2}([ ]?\-[ ]?){3,}[ \t]*$/gm,key);
		text = text.replace(/^[ ]{0,2}([ ]?\_[ ]?){3,}[ \t]*$/gm,key);

		text = _DoLists(text);
		text = _DoCodeBlocks(text);
		text = _DoBlockQuotes(text);

		// We already ran _HashHTMLBlocks() before, in Markdown(), but that
		// was to escape raw HTML in the original Markdown source. This time,
		// we're escaping the markup we've just created, so that we don't wrap
		// <p> tags around block-level tags.
		text = _HashHTMLBlocks(text);
		text = _FormParagraphs(text);

		return text;
	}


	var _RunSpanGamut = function(text) {
	//
	// These are all the transformations that occur *within* block-level
	// tags like paragraphs, headers, and list items.
	//

		text = _DoCodeSpans(text);
		text = _EscapeSpecialCharsWithinTagAttributes(text);
		text = _EncodeBackslashEscapes(text);

		// Process anchor and image tags. Images must come first,
		// because ![foo][f] looks like an anchor.
		text = _DoImages(text);
		text = _DoAnchors(text);

		// Make links out of things like `<http://example.com/>`
		// Must come after _DoAnchors(), because you can use < and >
		// delimiters in inline links like [this](<url>).
		text = _DoAutoLinks(text);
		text = _EncodeAmpsAndAngles(text);
		text = _DoItalicsAndBold(text);

		// Do hard breaks:
		text = text.replace(/  +\n/g," <br />\n");

		return text;
	}

	var _EscapeSpecialCharsWithinTagAttributes = function(text) {
	//
	// Within tags -- meaning between < and > -- encode [\ ` * _] so they
	// don't conflict with their use in Markdown for code, italics and strong.
	//

		// Build a regex to find HTML tags and comments.  See Friedl's 
		// "Mastering Regular Expressions", 2nd Ed., pp. 200-201.
		var regex = /(<[a-z\/!$]("[^"]*"|'[^']*'|[^'">])*>|<!(--.*?--\s*)+>)/gi;

		text = text.replace(regex, function(wholeMatch) {
			var tag = wholeMatch.replace(/(.)<\/?code>(?=.)/g,"$1`");
			tag = escapeCharacters(tag,"\\`*_");
			return tag;
		});

		return text;
	}

	var _DoAnchors = function(text) {
	//
	// Turn Markdown link shortcuts into XHTML <a> tags.
	//
		//
		// First, handle reference-style links: [link text] [id]
		//

		/*
			text = text.replace(/
			(							// wrap whole match in $1
				\[
				(
					(?:
						\[[^\]]*\]		// allow brackets nested one level
						|
						[^\[]			// or anything else
					)*
				)
				\]

				[ ]?					// one optional space
				(?:\n[ ]*)?				// one optional newline followed by spaces

				\[
				(.*?)					// id = $3
				\]
			)()()()()					// pad remaining backreferences
			/g,_DoAnchors_callback);
		*/
		text = text.replace(/(\[((?:\[[^\]]*\]|[^\[\]])*)\][ ]?(?:\n[ ]*)?\[(.*?)\])()()()()/g,writeAnchorTag);

		//
		// Next, inline-style links: [link text](url "optional title")
		//

		/*
			text = text.replace(/
				(						// wrap whole match in $1
					\[
					(
						(?:
							\[[^\]]*\]	// allow brackets nested one level
						|
						[^\[\]]			// or anything else
					)
				)
				\]
				\(						// literal paren
				[ \t]*
				()						// no id, so leave $3 empty
				<?(.*?)>?				// href = $4
				[ \t]*
				(						// $5
					(['"])				// quote char = $6
					(.*?)				// Title = $7
					\6					// matching quote
					[ \t]*				// ignore any spaces/tabs between closing quote and )
				)?						// title is optional
				\)
			)
			/g,writeAnchorTag);
		*/
		text = text.replace(/(\[((?:\[[^\]]*\]|[^\[\]])*)\]\([ \t]*()<?(.*?)>?[ \t]*((['"])(.*?)\6[ \t]*)?\))/g,writeAnchorTag);

		//
		// Last, handle reference-style shortcuts: [link text]
		// These must come last in case you've also got [link test][1]
		// or [link test](/foo)
		//

		/*
			text = text.replace(/
			(		 					// wrap whole match in $1
				\[
				([^\[\]]+)				// link text = $2; can't contain '[' or ']'
				\]
			)()()()()()					// pad rest of backreferences
			/g, writeAnchorTag);
		*/
		text = text.replace(/(\[([^\[\]]+)\])()()()()()/g, writeAnchorTag);

		return text;
	}

	var writeAnchorTag = function(wholeMatch,m1,m2,m3,m4,m5,m6,m7) {
		if (m7 == undefined) m7 = "";
		var whole_match = m1;
		var link_text   = m2;
		var link_id	 = m3.toLowerCase();
		var url		= m4;
		var title	= m7;
		
		if (url == "") {
			if (link_id == "") {
				// lower-case and turn embedded newlines into spaces
				link_id = link_text.toLowerCase().replace(/ ?\n/g," ");
			}
			url = "#"+link_id;
			
			if (g_urls[link_id] != undefined) {
				url = g_urls[link_id];
				if (g_titles[link_id] != undefined) {
					title = g_titles[link_id];
				}
			}
			else {
				if (whole_match.search(/\(\s*\)$/m)>-1) {
					// Special case for explicit empty url
					url = "";
				} else {
					return whole_match;
				}
			}
		}	
		
		url = escapeCharacters(url,"*_");
		var result = "<a href=\"" + url + "\"";
		
		if (title != "") {
			title = title.replace(/"/g,"&quot;");
			title = escapeCharacters(title,"*_");
			result +=  " title=\"" + title + "\"";
		}
		
		result += ">" + link_text + "</a>";
		
		return result;
	}


	var _DoImages = function(text) {
	//
	// Turn Markdown image shortcuts into <img> tags.
	//

		//
		// First, handle reference-style labeled images: ![alt text][id]
		//

		/*
			text = text.replace(/
			(						// wrap whole match in $1
				!\[
				(.*?)				// alt text = $2
				\]

				[ ]?				// one optional space
				(?:\n[ ]*)?			// one optional newline followed by spaces

				\[
				(.*?)				// id = $3
				\]
			)()()()()				// pad rest of backreferences
			/g,writeImageTag);
		*/
		text = text.replace(/(!\[(.*?)\][ ]?(?:\n[ ]*)?\[(.*?)\])()()()()/g,writeImageTag);

		//
		// Next, handle inline images:  ![alt text](url "optional title")
		// Don't forget: encode * and _

		/*
			text = text.replace(/
			(						// wrap whole match in $1
				!\[
				(.*?)				// alt text = $2
				\]
				\s?					// One optional whitespace character
				\(					// literal paren
				[ \t]*
				()					// no id, so leave $3 empty
				<?(\S+?)>?			// src url = $4
				[ \t]*
				(					// $5
					(['"])			// quote char = $6
					(.*?)			// title = $7
					\6				// matching quote
					[ \t]*
				)?					// title is optional
			\)
			)
			/g,writeImageTag);
		*/
		text = text.replace(/(!\[(.*?)\]\s?\([ \t]*()<?(\S+?)>?[ \t]*((['"])(.*?)\6[ \t]*)?\))/g,writeImageTag);

		return text;
	}

	var writeImageTag = function(wholeMatch,m1,m2,m3,m4,m5,m6,m7) {
		var whole_match = m1;
		var alt_text   = m2;
		var link_id	 = m3.toLowerCase();
		var url		= m4;
		var title	= m7;

		if (!title) title = "";
		
		if (url == "") {
			if (link_id == "") {
				// lower-case and turn embedded newlines into spaces
				link_id = alt_text.toLowerCase().replace(/ ?\n/g," ");
			}
			url = "#"+link_id;
			
			if (g_urls[link_id] != undefined) {
				url = g_urls[link_id];
				if (g_titles[link_id] != undefined) {
					title = g_titles[link_id];
				}
			}
			else {
				return whole_match;
			}
		}	
		
		alt_text = alt_text.replace(/"/g,"&quot;");
		url = escapeCharacters(url,"*_");
		var result = "<img src=\"" + url + "\" alt=\"" + alt_text + "\"";

		// attacklab: Markdown.pl adds empty title attributes to images.
		// Replicate this bug.

		//if (title != "") {
			title = title.replace(/"/g,"&quot;");
			title = escapeCharacters(title,"*_");
			result +=  " title=\"" + title + "\"";
		//}
		
		result += " />";
		
		return result;
	}


	var _DoHeaders = function(text) {

		// Setext-style headers:
		//	Header 1
		//	========
		//  
		//	Header 2
		//	--------
		//
		text = text.replace(/^(.+)[ \t]*\n=+[ \t]*\n+/gm,
			function(wholeMatch,m1){return hashBlock("<h1>" + _RunSpanGamut(m1) + "</h1>");});

		text = text.replace(/^(.+)[ \t]*\n-+[ \t]*\n+/gm,
			function(matchFound,m1){return hashBlock("<h2>" + _RunSpanGamut(m1) + "</h2>");});

		// atx-style headers:
		//  # Header 1
		//  ## Header 2
		//  ## Header 2 with closing hashes ##
		//  ...
		//  ###### Header 6
		//

		/*
			text = text.replace(/
				^(\#{1,6})				// $1 = string of #'s
				[ \t]*
				(.+?)					// $2 = Header text
				[ \t]*
				\#*						// optional closing #'s (not counted)
				\n+
			/gm, function() {...});
		*/

		text = text.replace(/^(\#{1,6})[ \t]*(.+?)[ \t]*\#*\n+/gm,
			function(wholeMatch,m1,m2) {
				var h_level = m1.length;
				return hashBlock("<h" + h_level + ">" + _RunSpanGamut(m2) + "</h" + h_level + ">");
			});

		return text;
	}

	// This declaration keeps Dojo compressor from outputting garbage:
	var _ProcessListItems;

	var _DoLists = function(text) {
	//
	// Form HTML ordered (numbered) and unordered (bulleted) lists.
	//

		// attacklab: add sentinel to hack around khtml/safari bug:
		// http://bugs.webkit.org/show_bug.cgi?id=11231
		text += "~0";

		// Re-usable pattern to match any entirel ul or ol list:

		/*
			var whole_list = /
			(									// $1 = whole list
				(								// $2
					[ ]{0,3}					// attacklab: g_tab_width - 1
					([*+-]|\d+[.])				// $3 = first list item marker
					[ \t]+
				)
				[^\r]+?
				(								// $4
					~0							// sentinel for workaround; should be $
				|
					\n{2,}
					(?=\S)
					(?!							// Negative lookahead for another list item marker
						[ \t]*
						(?:[*+-]|\d+[.])[ \t]+
					)
				)
			)/g
		*/
		var whole_list = /^(([ ]{0,3}([*+-]|\d+[.])[ \t]+)[^\r]+?(~0|\n{2,}(?=\S)(?![ \t]*(?:[*+-]|\d+[.])[ \t]+)))/gm;

		if (g_list_level) {
			text = text.replace(whole_list,function(wholeMatch,m1,m2) {
				var list = m1;
				var list_type = (m2.search(/[*+-]/g)>-1) ? "ul" : "ol";

				// Turn double returns into triple returns, so that we can make a
				// paragraph for the last item in a list, if necessary:
				list = list.replace(/\n{2,}/g,"\n\n\n");;
				var result = _ProcessListItems(list);
		
				// Trim any trailing whitespace, to put the closing `</$list_type>`
				// up on the preceding line, to get it past the current stupid
				// HTML block parser. This is a hack to work around the terrible
				// hack that is the HTML block parser.
				result = result.replace(/\s+$/,"");
				result = "<"+list_type+">" + result + "</"+list_type+">\n";
				return result;
			});
		} else {
			whole_list = /(\n\n|^\n?)(([ ]{0,3}([*+-]|\d+[.])[ \t]+)[^\r]+?(~0|\n{2,}(?=\S)(?![ \t]*(?:[*+-]|\d+[.])[ \t]+)))/g;
			text = text.replace(whole_list,function(wholeMatch,m1,m2,m3) {
				var runup = m1;
				var list = m2;

				var list_type = (m3.search(/[*+-]/g)>-1) ? "ul" : "ol";
				// Turn double returns into triple returns, so that we can make a
				// paragraph for the last item in a list, if necessary:
				var list = list.replace(/\n{2,}/g,"\n\n\n");;
				var result = _ProcessListItems(list);
				result = runup + "<"+list_type+">\n" + result + "</"+list_type+">\n";	
				return result;
			});
		}

		// attacklab: strip sentinel
		text = text.replace(/~0/,"");

		return text;
	}

	_ProcessListItems = function(list_str) {
	//
	//  Process the contents of a single ordered or unordered list, splitting it
	//  into individual list items.
	//
		// The $g_list_level global keeps track of when we're inside a list.
		// Each time we enter a list, we increment it; when we leave a list,
		// we decrement. If it's zero, we're not in a list anymore.
		//
		// We do this because when we're not inside a list, we want to treat
		// something like this:
		//
		//    I recommend upgrading to version
		//    8. Oops, now this line is treated
		//    as a sub-list.
		//
		// As a single paragraph, despite the fact that the second line starts
		// with a digit-period-space sequence.
		//
		// Whereas when we're inside a list (or sub-list), that line will be
		// treated as the start of a sub-list. What a kludge, huh? This is
		// an aspect of Markdown's syntax that's hard to parse perfectly
		// without resorting to mind-reading. Perhaps the solution is to
		// change the syntax rules such that sub-lists must start with a
		// starting cardinal number; e.g. "1." or "a.".

		g_list_level++;

		// trim trailing blank lines:
		list_str = list_str.replace(/\n{2,}$/,"\n");

		// attacklab: add sentinel to emulate \z
		list_str += "~0";

		/*
			list_str = list_str.replace(/
				(\n)?							// leading line = $1
				(^[ \t]*)						// leading whitespace = $2
				([*+-]|\d+[.]) [ \t]+			// list marker = $3
				([^\r]+?						// list item text   = $4
				(\n{1,2}))
				(?= \n* (~0 | \2 ([*+-]|\d+[.]) [ \t]+))
			/gm, function(){...});
		*/
		list_str = list_str.replace(/(\n)?(^[ \t]*)([*+-]|\d+[.])[ \t]+([^\r]+?(\n{1,2}))(?=\n*(~0|\2([*+-]|\d+[.])[ \t]+))/gm,
			function(wholeMatch,m1,m2,m3,m4){
				var item = m4;
				var leading_line = m1;
				var leading_space = m2;

				if (leading_line || (item.search(/\n{2,}/)>-1)) {
					item = _RunBlockGamut(_Outdent(item));
				}
				else {
					// Recursion for sub-lists:
					item = _DoLists(_Outdent(item));
					item = item.replace(/\n$/,""); // chomp(item)
					item = _RunSpanGamut(item);
				}

				return  "<li>" + item + "</li>\n";
			}
		);

		// attacklab: strip sentinel
		list_str = list_str.replace(/~0/g,"");

		g_list_level--;
		return list_str;
	}


	var _DoCodeBlocks = function(text) {
	//
	//  Process Markdown `<pre><code>` blocks.
	//  

		/*
			text = text.replace(text,
				/(?:\n\n|^)
				(								// $1 = the code block -- one or more lines, starting with a space/tab
					(?:
						(?:[ ]{4}|\t)			// Lines must start with a tab or a tab-width of spaces - attacklab: g_tab_width
						.*\n+
					)+
				)
				(\n*[ ]{0,3}[^ \t\n]|(?=~0))	// attacklab: g_tab_width
			/g,function(){...});
		*/

		// attacklab: sentinel workarounds for lack of \A and \Z, safari\khtml bug
		text += "~0";
		
		text = text.replace(/(?:\n\n|^)((?:(?:[ ]{4}|\t).*\n+)+)(\n*[ ]{0,3}[^ \t\n]|(?=~0))/g,
			function(wholeMatch,m1,m2) {
				var codeblock = m1;
				var nextChar = m2;
			
				codeblock = _EncodeCode( _Outdent(codeblock));
				codeblock = _Detab(codeblock);
				codeblock = codeblock.replace(/^\n+/g,""); // trim leading newlines
				codeblock = codeblock.replace(/\n+$/g,""); // trim trailing whitespace

				codeblock = "<pre><code>" + codeblock + "\n</code></pre>";

				return hashBlock(codeblock) + nextChar;
			}
		);

		// attacklab: strip sentinel
		text = text.replace(/~0/,"");

		return text;
	}

	var hashBlock = function(text) {
		text = text.replace(/(^\n+|\n+$)/g,"");
		return "\n\n~K" + (g_html_blocks.push(text)-1) + "K\n\n";
	}


	var _DoCodeSpans = function(text) {
	//
	//   *  Backtick quotes are used for <code></code> spans.
	// 
	//   *  You can use multiple backticks as the delimiters if you want to
//		 include literal backticks in the code span. So, this input:
//		 
//			 Just type ``foo `bar` baz`` at the prompt.
//		 
//		   Will translate to:
//		 
//			 <p>Just type <code>foo `bar` baz</code> at the prompt.</p>
//		 
//		There's no arbitrary limit to the number of backticks you
//		can use as delimters. If you need three consecutive backticks
//		in your code, use four for delimiters, etc.
	//
	//  *  You can use spaces to get literal backticks at the edges:
//		 
//			 ... type `` `bar` `` ...
//		 
//		   Turns to:
//		 
//			 ... type <code>`bar`</code> ...
	//

		/*
			text = text.replace(/
				(^|[^\\])					// Character before opening ` can't be a backslash
				(`+)						// $2 = Opening run of `
				(							// $3 = The code block
					[^\r]*?
					[^`]					// attacklab: work around lack of lookbehind
				)
				\2							// Matching closer
				(?!`)
			/gm, function(){...});
		*/

		text = text.replace(/(^|[^\\])(`+)([^\r]*?[^`])\2(?!`)/gm,
			function(wholeMatch,m1,m2,m3,m4) {
				var c = m3;
				c = c.replace(/^([ \t]*)/g,"");	// leading whitespace
				c = c.replace(/[ \t]*$/g,"");	// trailing whitespace
				c = _EncodeCode(c);
				return m1+"<code>"+c+"</code>";
			});

		return text;
	}


	var _EncodeCode = function(text) {
	//
	// Encode/escape certain characters inside Markdown code runs.
	// The point is that in code, these characters are literals,
	// and lose their special Markdown meanings.
	//
		// Encode all ampersands; HTML entities are not
		// entities within a Markdown code span.
		// text = text.replace(/&/g,"&amp;");

		// Do the angle bracket song and dance:
		text = text.replace(/</g,"&lt;");
		text = text.replace(/>/g,"&gt;");

		// Now, escape characters that are magic in Markdown:
		text = escapeCharacters(text,"\*{}[]\\",false);

	// jj the line above breaks this:
	//---

	//* Item

	//   1. Subitem

//	            special char: *
	//---

		return text;
	}


	var _DoItalicsAndBold = function(text) {

		// <strong> must go first:
		text = text.replace(/(\*\*|__)(?=\S)([^\r]*?\S[*_]*)\1/g,
			"<strong>$2</strong>");

		text = text.replace(/(\*|_)(?=\S)([^\r]*?\S)\1/g,
			"<em>$2</em>");

		return text;
	}


	var _DoBlockQuotes = function(text) {

		/*
			text = text.replace(/
			(								// Wrap whole match in $1
				(
					^[ \t]*>[ \t]?			// '>' at the start of a line
					.+\n					// rest of the first line
					(.+\n)*					// subsequent consecutive lines
					\n*						// blanks
				)+
			)
			/gm, function(){...});
		*/

		text = text.replace(/((^[ \t]*>[ \t]?.+\n(.+\n)*\n*)+)/gm,
			function(wholeMatch,m1) {
				var bq = m1;

				// attacklab: hack around Konqueror 3.5.4 bug:
				// "----------bug".replace(/^-/g,"") == "bug"

				bq = bq.replace(/^[ \t]*>[ \t]?/gm,"~0");	// trim one level of quoting

				// attacklab: clean up hack
				bq = bq.replace(/~0/g,"");

				bq = bq.replace(/^[ \t]+$/gm,"");		// trim whitespace-only lines
				bq = _RunBlockGamut(bq);				// recurse
				
				bq = bq.replace(/(^|\n)/g,"$1  ");
				// These leading spaces screw with <pre> content, so we need to fix that:
				bq = bq.replace(
						/(\s*<pre>[^\r]+?<\/pre>)/gm,
					function(wholeMatch,m1) {
						var pre = m1;
						// attacklab: hack around Konqueror 3.5.4 bug:
						pre = pre.replace(/^  /mg,"~0");
						pre = pre.replace(/~0/g,"");
						return pre;
					});
				
				return hashBlock("<blockquote>\n" + bq + "\n</blockquote>");
			});
		return text;
	}


	var _FormParagraphs = function(text) {
	//
	//  Params:
//	    $text - string to process with html <p> tags
	//

		// Strip leading and trailing lines:
		text = text.replace(/^\n+/g,"");
		text = text.replace(/\n+$/g,"");

		var grafs = text.split(/\n{2,}/g);
		var grafsOut = new Array();

		//
		// Wrap <p> tags.
		//
		var end = grafs.length;
		for (var i=0; i<end; i++) {
			var str = grafs[i];

			// if this is an HTML marker, copy it
			if (str.search(/~K(\d+)K/g) >= 0) {
				grafsOut.push(str);
			}
			else if (str.search(/\S/) >= 0) {
				str = _RunSpanGamut(str);
				str = str.replace(/^([ \t]*)/g,"<p>");
				str += "</p>"
				grafsOut.push(str);
			}

		}

		//
		// Unhashify HTML blocks
		//
		end = grafsOut.length;
		for (var i=0; i<end; i++) {
			// if this is a marker for an html block...
			while (grafsOut[i].search(/~K(\d+)K/) >= 0) {
				var blockText = g_html_blocks[RegExp.$1];
				blockText = blockText.replace(/\$/g,"$$$$"); // Escape any dollar signs
				grafsOut[i] = grafsOut[i].replace(/~K\d+K/,blockText);
			}
		}

		return grafsOut.join("\n\n");
	}


	var _EncodeAmpsAndAngles = function(text) {
	// Smart processing for ampersands and angle brackets that need to be encoded.
		
		// Ampersand-encoding based entirely on Nat Irons's Amputator MT plugin:
		//   http://bumppo.net/projects/amputator/
		text = text.replace(/&(?!#?[xX]?(?:[0-9a-fA-F]+|\w+);)/g,"&amp;");
		
		// Encode naked <'s
		text = text.replace(/<(?![a-z\/?\$!])/gi,"&lt;");
		
		return text;
	}


	var _EncodeBackslashEscapes = function(text) {
	//
	//   Parameter:  String.
	//   Returns:	The string, with after processing the following backslash
//				   escape sequences.
	//

		// attacklab: The polite way to do this is with the new
		// escapeCharacters() function:
		//
		// 	text = escapeCharacters(text,"\\",true);
		// 	text = escapeCharacters(text,"`*_{}[]()>#+-.!",true);
		//
		// ...but we're sidestepping its use of the (slow) RegExp constructor
		// as an optimization for Firefox.  This function gets called a LOT.

		text = text.replace(/\\(\\)/g,escapeCharacters_callback);
		text = text.replace(/\\([`*_{}\[\]()>#+-.!])/g,escapeCharacters_callback);
		return text;
	}


	var _DoAutoLinks = function(text) {

		text = text.replace(/<((https?|ftp|dict):[^'">\s]+)>/gi,"<a href=\"$1\">$1</a>");

		// Email addresses: <address@domain.foo>

		/*
			text = text.replace(/
				<
				(?:mailto:)?
				(
					[-.\w]+
					\@
					[-a-z0-9]+(\.[-a-z0-9]+)*\.[a-z]+
				)
				>
			/gi, _DoAutoLinks_callback());
		*/
		text = text.replace(/<(?:mailto:)?([-.\w]+\@[-a-z0-9]+(\.[-a-z0-9]+)*\.[a-z]+)>/gi,
			function(wholeMatch,m1) {
				return _EncodeEmailAddress( _UnescapeSpecialChars(m1) );
			}
		);

		return text;
	}


	var _EncodeEmailAddress = function(addr) {
	//
	//  Input: an email address, e.g. "foo@example.com"
	//
	//  Output: the email address as a mailto link, with each character
//		of the address encoded as either a decimal or hex entity, in
//		the hopes of foiling most address harvesting spam bots. E.g.:
	//
//		<a href="&#x6D;&#97;&#105;&#108;&#x74;&#111;:&#102;&#111;&#111;&#64;&#101;
//		   x&#x61;&#109;&#x70;&#108;&#x65;&#x2E;&#99;&#111;&#109;">&#102;&#111;&#111;
//		   &#64;&#101;x&#x61;&#109;&#x70;&#108;&#x65;&#x2E;&#99;&#111;&#109;</a>
	//
	//  Based on a filter by Matthew Wickline, posted to the BBEdit-Talk
	//  mailing list: <http://tinyurl.com/yu7ue>
	//

		// attacklab: why can't javascript speak hex?
		function char2hex(ch) {
			var hexDigits = '0123456789ABCDEF';
			var dec = ch.charCodeAt(0);
			return(hexDigits.charAt(dec>>4) + hexDigits.charAt(dec&15));
		}

		var encode = [
			function(ch){return "&#"+ch.charCodeAt(0)+";";},
			function(ch){return "&#x"+char2hex(ch)+";";},
			function(ch){return ch;}
		];

		addr = "mailto:" + addr;

		addr = addr.replace(/./g, function(ch) {
			if (ch == "@") {
			   	// this *must* be encoded. I insist.
				ch = encode[Math.floor(Math.random()*2)](ch);
			} else if (ch !=":") {
				// leave ':' alone (to spot mailto: later)
				var r = Math.random();
				// roughly 10% raw, 45% hex, 45% dec
				ch =  (
						r > .9  ?	encode[2](ch)   :
						r > .45 ?	encode[1](ch)   :
									encode[0](ch)
					);
			}
			return ch;
		});

		addr = "<a href=\"" + addr + "\">" + addr + "</a>";
		addr = addr.replace(/">.+:/g,"\">"); // strip the mailto: from the visible part

		return addr;
	}


	var _UnescapeSpecialChars = function(text) {
	//
	// Swap back in all the special characters we've hidden.
	//
		text = text.replace(/~E(\d+)E/g,
			function(wholeMatch,m1) {
				var charCodeToReplace = parseInt(m1);
				return String.fromCharCode(charCodeToReplace);
			}
		);
		return text;
	}


	var _Outdent = function(text) {
	//
	// Remove one level of line-leading tabs or spaces
	//

		// attacklab: hack around Konqueror 3.5.4 bug:
		// "----------bug".replace(/^-/g,"") == "bug"

		text = text.replace(/^(\t|[ ]{1,4})/gm,"~0"); // attacklab: g_tab_width

		// attacklab: clean up hack
		text = text.replace(/~0/g,"")

		return text;
	}

	var _Detab = function(text) {
	// attacklab: Detab's completely rewritten for speed.
	// In perl we could fix it by anchoring the regexp with \G.
	// In javascript we're less fortunate.

		// expand first n-1 tabs
		text = text.replace(/\t(?=\t)/g,"    "); // attacklab: g_tab_width

		// replace the nth with two sentinels
		text = text.replace(/\t/g,"~A~B");

		// use the sentinel to anchor our regex so it doesn't explode
		text = text.replace(/~B(.+?)~A/g,
			function(wholeMatch,m1,m2) {
				var leadingText = m1;
				var numSpaces = 4 - leadingText.length % 4;  // attacklab: g_tab_width

				// there *must* be a better way to do this:
				for (var i=0; i<numSpaces; i++) leadingText+=" ";

				return leadingText;
			}
		);

		// clean up sentinels
		text = text.replace(/~A/g,"    ");  // attacklab: g_tab_width
		text = text.replace(/~B/g,"");

		return text;
	}


	//
	//  attacklab: Utility functions
	//


	var escapeCharacters = function(text, charsToEscape, afterBackslash) {
		// First we have to escape the escape characters so that
		// we can build a character class out of them
		var regexString = "([" + charsToEscape.replace(/([\[\]\\])/g,"\\$1") + "])";

		if (afterBackslash) {
			regexString = "\\\\" + regexString;
		}

		var regex = new RegExp(regexString,"g");
		text = text.replace(regex,escapeCharacters_callback);

		return text;
	}


	var escapeCharacters_callback = function(wholeMatch,m1) {
		var charCodeToEscape = m1.charCodeAt(0);
		return "~E"+charCodeToEscape+"E";
	}

} // end of Showdown.converter
var Showdown=Attacklab.showdown;
if(Attacklab.fileLoaded){
Attacklab.fileLoaded("showdown.js");
}

